Datasheet

DocID029162 Rev 6 25/208
STM32F413xG/H Functional overview
42
3.16 Power supply schemes
• V
DD
= 1.7 to 3.6 V: external power supply for I/Os with the internal supervisor
(POR/PDR) disabled, provided externally through V
DD
pins. Requires the use of an
external power supply supervisor connected to the V
DD
and NRST pins.
• V
SSA
, V
DDA
= 1.7 to 3.6 V: external analog power supplies for ADC, Reset blocks, RCs
and PLL. V
DDA
and V
SSA
must be connected to V
DD
and V
SS
, respectively, with
decoupling technique.
Note: The V
DD
/V
DDA
minimum value of 1.7 V is obtained with the use of an external power supply
supervisor (refer to
Section 3.17.2: Internal reset OFF). Refer to Table 4: Regulator ON/OFF
and internal power supply supervisor availability to identify the packages supporting this
option.
• V
BAT
= 1.65 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and
backup registers (through power switch) when V
DD
is not present.
• V
DDUSB
can be connected either to VDD or an external independent power supply (3.0
to 3.6 V) for USB transceivers.
For example, when device is powered at 1.8 V, an independent power supply 3.3V can
be connected to V
DDUSB
. When the V
DDUSB
is connected to a separated power supply,
it is independent from V
DD
or V
DDA
but it must be the last supply to be provided and the
first to disappear.
The following conditions VDDUSB must be respected:
– During power-on phase (V
DD
< V
DD_MIN
), V
DDUSB
should be always lower than
V
DD
– During power-down phase (V
DD
< V
DD_MIN
), V
DDUSB
should be always lower than
V
DD
–V
DDUSB
rising and falling time rate specifications must be respected.
– In operating mode phase, V
DDUSB
could be lower or higher than VDD:
– If USB is used, the associated GPIOs powered by V
DDUSB
are operating
between V
DDUSB_MIN
and V
DDUSB_MAX
.
– If USB is not used, the associated GPIOs powered by V
DDUSB
are operating
between V
DD_MIN
and V
DD_MAX
.
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